Lots of interesting material in the paper. Check it out and check out the commentary. Also, the commentary has a great figure which I think I will probably use for many purposes:

Microbial diversity in outdoor environments and BEs. On the left is the silhouette of a cowboy brushing past a pine tree while riding a horse. On the right is the silhouette of a person sitting in an office chair and working on a laptop. Blue microbes are human associated, while other colors represent nonhuman microbial diversity. (Note in the Acknowledgements there is this text about the Figure: I gratefully acknowledge Cache Gibbons and Samantha Veysey for the original artwork in Fig. 1)